Plow-point pattern-plate



E. M. WRIGHT.

PLOW POINT PATTERN PLATE.

APPLICATION FILED DEC. 24, 1919.

1,365,214. Patented Jim.11 ,-1921.

2 SHETS-SHEET I.

TINTHlllllllllllllllll INVENTOR/ ATTOFQN EY E. M. WRIGHT.

PLOW PGINT PATTERN PLATE.

APPLICATION FILED 0:924, 1919.

1,365,214. Patented Jan. 11,1921.

WITNESSES i r I ATTORNEY EDWARD M. WRIGHT, or MADISON HEIGHTS, VIRGINIA,

PLoW-rom'r PATTERn- 'LATE U Applicationfiled December 24, 1919. Serial No. 347,146.

To aZZwhom it may concern:

Be it known that I, EDWARD M. WRIsI-rr, a citizen of the United States, residinnat Madison Heights, in the county of i mherst and State of Vir inia, have invented a new and useful Plowoint Pattern-Plate, of which the following is a specification.

This invention has reference to plow point pattern plates, and its object is to eliminate certain objectionable features which are present in prior pattern plates.

Plow points of the character to which this invention relates are each provided with an overhanging lug to lockt'he point securely to the standard. To produce" the lug cavity in the mold, it has been the custom to use a detachable movable piece operated by a cam or similar device. Such movable piece complicates the structure, wherefore, in accordance with the invention,'that part of the pattern producing the cavity, to in turn form the locking lug, is made ahinged structure which is readily yieldable to the removal of the cope piece of the flask when lifted from the pattern plate, the yielding being entirely automatic and the constructionbeing of extreme simplicity. More over, provision is made for the disposition of any loose sand which may be dislodged by the turning of the lug pattern on its hinge. v

In producing molds from plow point plates in molding machines, it has been the practice toheat the plates so that the damp sand will not adhere thereto. In accordance with one method, a kerosene torch is placed under the plate to produce the necessary heat, but this is injurious and detrimental to health because the operator is liable to inhale the smoke and gases from the torch. Alcohol lamps and charcoal are sometimes used, but these methods are likewise injurious to the health of the operator and produce an irregular and very unsatisfactory heat. These methods produce more or less soot, which isliable to clog u'p necessary mechanisms that are sometimes put on the plates. f

The invention contemplates the employment of an electrically" energized heating unit at therear face of each pattern element or plate, which heating unit is clean, uniform, does not give off any fumes or gases, and may be controlled to a nicety.

Fig. 3.

The invention will be best understood from a consideration of the) following de tailed description taken in connection with Specification of Letters Patent. Patented J {ML 11 1921 the accompanying drawings forming part of this.specifibation', withthe understand ing, however, that the inventionis not coniined to any strict conformitywi'th the showl g t drawlngs, but maybe changed and modifiedso long as such changes and modifications mark no material departure from 'thesalient features of the invention as expressed in the I appended claims.

(In thedrawings, Figure l is a perspective view of one of the pattern plates.

F ig.*2.is a perspective view of the other pattern plate.'- V

vFig. 3 is a bottom planview of the plate shown in Fig.1. 7 I Fig.4 is a' section on the line air-4C of Fig.6 is a perspective view of'the hinged member constitutingthe pattern block for the point locking'lug.

5 is asection on the line 5-5 of Referring to the drawings, there are showntwo pattern plates A and B, respectively. The plate Ais provided with a pattern 1 and the plateB with a pattern 2,

one plat-ebeing used to make the cope impression andthe other plate to make the drag lmpression, and the two Impressions produce the mold. The plate A comprises a frame 3--sur-.

rounding a mass & of concrete orother such refractory material, in wh ch 'is lodged ,in a recess thereof. the pattern 1 exposed on one face "of the plate,and=the plate B is similarly constructed, beingprovided with a frame 5 and a mass 6, of concrete embedding the pattern 2. In the process of producing themold, the two plates are used in conjunction with the cope and drag in the usual manner. The general construction of the two platesjis that customarily employed and needs no special descriptio In plow points of the character indicated in the'drawings, the point is providedwith a linear lockinglug by "means of which it is held to the plow standard. As heretofore produced, an overhanging locking lug is formed by means of a pattern member comprising a detachable movable piece operated by a cam or similar device slidable underneath the plate. This arrangement is productive of a cavity in the mold.

In accordance with the invention, a different and much simpler means for the produc-' ment 7 and forms the overhanging portion of the locking lug in the finished plow point.

The block 11 is free to turn about the axis of the pivot 10 so that when the cope piece of the. flask is lifted from the plate B, the block yields in a direction to readily draw from the sand without material disturbance thereof and without the necessity of provid ing manipulating means for moving the pattern device, for forming the overhanging lug, out of interfering relation with the sand. The hinged block constitutes a simple and very efiicient 'automaticmeans for permitting the block to give andclear from the sand, but it is to be understood that other suitable automatic means may be employed for the purpose, for the invention in this respect is not necessarily confined to a hinged block. a

The hinged block 11 has a nose end 12 beveled on its underside and overhanging the corresponding portion of the pattern 2, and under the basic portion of the hinged. block, a passage 13 is formed through the pattern 2 to the basic portion of the plate B, so that any sand which may be loosened by the raising of the hinged block will find escape through the passage 13 and not pack.

Carried by the respective plates A and B, underneath and spaced from the pattern 1 or 2, as the case may be, is an electric heating element 14: comprising a grid 15 of resistance wire or other suitable material confined between insulating sheets 16 or baked in refractory insulating material, and provided with a conducting cord 17 leading away from the heating element to be connected to a suitable source of electric current. The heating element 14: is made to conform approximately to the pattern 1, or 2, and after the sand is applied, the current is turned on and the" heat produced passes through the pattern to the sand. The purpose of the heating element is to prevent damp sand from adhering to the plate and pattern, and this "can be brought about with a nicety by the electric heater because the heat may be applied directly where wanted, hasno'fouling effects, and may be regulated within close limits.

The bottom of each plate is in the form of a pan-like plate 18 riveted or otherwise secured to the frame 3, wherefore to receive and hold the mass 4: of concrete in the plate A or B, as the case may be. As Fig. 1 shows, screws 19 extending through the heating element hold the latter directly against the pan 18 and pass through the intervening concrete and into the pattern plate 1 or 2, as the case may be.

So far as I am aware, I believe that I am the first to vprovide an electric heating arrangement for pattern plates. Experience has shown it to be vastly superior to the usualheating methods. Moreover, the electric heater permits the application of the heat, readily regulated, inthe most efficient position to dry the damp sand.

lVhat is claimed is:

1. A plowpoint pattern plate provided with a projection on the mold-forming face and gradually rising therefrom, a block hinged at one end to the projection and constituting a substantially linear continuation thereof in overhanging relation to the corresponding portionof the pattern, and a passage leading from the block for the escape of any sand which may be loosened by the raising of the block.

2. A plow point pattern plate provided witha projection on the mold-forming face,

and a freely yieldable block constituting a continuation thereof in overhanging relation to the corresponding portion of the pattern, said pattern having a passage therethrough leading from beneath the yieldable block to carry loose sand therethrough.

8. A plow point pattern plate provided with a portion for forming an overhanging locking lug on the finished plow point, said pattern member having the overhanging portion automatically yieldable to the withdrawal of the cope member from the pattern plate, and'said pattern plate having a passage therethrough leading from beneath the yieldable portion of the locking-lug pattern member.

EDWARD M. WRIGHT.

Witnesses I S'. G. HARRISS, J. L. THOMAS. 

